Kaoru Totsuka

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Noise reducing apparatus

Wave transmission lines and networks – Amplitude compression and expansion systems
Patent

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Noise reduction system having series connected low and high freq

Wave transmission lines and networks – Amplitude compression and expansion systems
Patent

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Variable directional microphone system

Optics: motion pictures – Removable film strip magazine type
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Variable-directivity microphone device

Patent

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Variable-directivity microphone device

Electrical audio signal processing systems and devices – Directive circuits for microphones
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Profile ID: LFUS-PAI-P-403936

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